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- Asimakidou, E, et al.
(author)
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The positive dimension of schizotypy is associated with a reduced attenuation and precision of self-generated touch
- 2022
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In: Schizophrenia (Heidelberg, Germany). - : Springer Science and Business Media LLC. - 2754-6993. ; 8:1, s. 57-
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Journal article (peer-reviewed)abstract
- The brain predicts the sensory consequences of our movements and uses these predictions to attenuate the perception of self-generated sensations. Accordingly, self-generated touch feels weaker than an externally generated touch of identical intensity. In schizophrenia, this somatosensory attenuation is substantially reduced, suggesting that patients with positive symptoms fail to accurately predict and process self-generated touch. If an impaired prediction underlies the positive symptoms of schizophrenia, then a similar impairment should exist in healthy nonclinical individuals with high positive schizotypal traits. One hundred healthy participants (53 female), assessed for schizotypal traits, underwent a well-established psychophysics force discrimination task to quantify how they perceived self-generated and externally generated touch. The perceived intensity of tactile stimuli delivered to their left index finger (magnitude) and the ability to discriminate the stimuli (precision) was measured. We observed that higher positive schizotypal traits were associated with reduced somatosensory attenuation and poorer somatosensory precision of self-generated touch, both when treating schizotypy as a continuous or categorical variable. These effects were specific to positive schizotypy and were not observed for the negative or disorganized dimensions of schizotypy. The results suggest that positive schizotypal traits are associated with a reduced ability to predict and process self-generated touch. Given that the positive dimension of schizotypy represents the analogue of positive psychotic symptoms of schizophrenia, deficits in processing self-generated tactile information could indicate increased liability to schizophrenia.
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- Kilteni, K, et al.
(author)
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Body ownership determines the attenuation of self-generated tactile sensations
- 2017
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In: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 1091-6490. ; 114:31, s. 8426-8431
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Journal article (peer-reviewed)abstract
- When we touch one hand with the other, the touch feels less intense than identical touches generated by another person or robot. This is because our brain predicts the contact between our hands and attenuates the expected sensation. Here, we describe how the attenuation of self-touch depends on the experienced ownership of the touching hand. We found that illusory self-touch with a rubber hand that feels like one’s own is attenuated. We also found the reverse: The attenuation of real self-touch is reduced when the rubber hand that feels like one’s own is far from the receiving hand. These findings are important because they demonstrate that sensory predictions and sensory attenuation depend on the sense of ownership of the body.
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